[Float Only] Saving & Loading Settings on SD Card Arduino

/*
  Saving & Loading Settings on SD Card with Arduino by Alex Shu
  http://overskill.alexshu.com/saving-loading-settings-on-sd-card-with-arduino/

  SD card connections:
 ** MOSI - pin 11
 ** MISO - pin 12
 ** CLK - pin 13
 ** CS - pin 4

 This Is an altered version by request for float only.
 */

 #include <SPI.h>
 #include <SD.h>

 File myFile;
 float kiloWatts = 0.001;
 const int decimal_point = 3;


 void setup()
 {
 // Open serial communications and wait for port to open:
 Serial.begin(9600);
 while (!Serial) {
 ; // wait for serial port to connect. Needed for Leonardo only
 }
 Serial.print("Initializing SD card...");
 // On the Ethernet Shield, CS is pin 4. It's set as an output by default.
 // Note that even if it's not used as the CS pin, the hardware SS pin
 // (10 on most Arduino boards, 53 on the Mega) must be left as an output
 // or the SD library functions will not work.
 pinMode(10, OUTPUT);
 if (!SD.begin(4)) {
 Serial.println("initialization failed!");
 return;
 }
 Serial.println("initialization done.");
 readSDSettings();

 /*
 //Debuuging Printing
 Serial.println("In RAM Memory");
 Serial.print("kiloWatts=");
 Serial.println(kiloWatts,decimal_point);

 */
 }

 void loop()
 {
    // ##########################################################################
    // ##########   SAVE YOUR PARAMETERS HERE - call writeSDSettings();  ########
    // ##########################################################################


        // writeSDSettings();

 }

 void readSDSettings(){
 char character;
 String settingName;
 String settingValue;
 myFile = SD.open("kwcounter.txt");
 if (myFile) {
 while (myFile.available()) {
 character = myFile.read();
 while((myFile.available()) && (character != '[')){
 character = myFile.read();
 }
 character = myFile.read();
 while((myFile.available()) && (character != '=')){
 settingName = settingName + character;
 character = myFile.read();
 }
 character = myFile.read();
 while((myFile.available()) && (character != ']')){
 settingValue = settingValue + character;
 character = myFile.read();
 }
 if(character == ']'){

 /*
 //Debuuging Printing
 Serial.print("Name:");
 Serial.println(settingName);
 Serial.print("Value :");
 Serial.println(settingValue);
 */

 // Apply the value to the parameter
 applySetting(settingName,settingValue);
 // Reset Strings
 settingName = "";
 settingValue = "";
 }
 }
 // close the file:
 myFile.close();
 } else {
 // if the file didn't open, print an error:
 Serial.println("error opening kwcounter.txt");
 }
 }

 /* Apply the value to the parameter by searching for the parameter name
 toFloat(string); for Float
 */
 void applySetting(String settingName, String settingValue) {
 if(settingName == "kiloWatts") {
 kiloWatts=toFloat(settingValue);
 }
 }

 // converting string to Float
 float toFloat(String settingValue){
 char floatbuf[settingValue.length()+1];
 settingValue.toCharArray(floatbuf, sizeof(floatbuf));
 float f = atof(floatbuf);
 return f;
 }

 // Writes A Configuration file
 void writeSDSettings() {
 // Delete the old One
 SD.remove("kwcounter.txt");
 // Create new one
 myFile = SD.open("kwcounter.txt", FILE_WRITE);
 // writing in the file works just like regular print()/println() function
 myFile.print("[");
 myFile.print("kiloWatts=");
 myFile.print(kiloWatts,decimal_point);
 myFile.println("]");
 // close the file:
 myFile.close();
 //Serial.println("Writing done.");
 }